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There arc many organs or tissues around the lumbar region which would produce low back pain. The first step to treat the patients with low back pain is to identify the tissues or organs which give rise to the pain. The analysis of the motor unit action potentials from the erector spinae and the gluteus maximus muscles could be of use in the objective evaluation of the low back pain. The present paper describes the quantitative analysis of the motor unit action potentials from the erector spinae and the gluteus maximus muscles using computer, with the purpose of identifying the tissues giving rise to low back pain. The subjects observed consisted of 84 patients with low back pain and 20 normal persons ( 104 subjects in total) . Electromyograms were taken with concentric needle electrodes from the erector spinae and the gluteus maximus muscles during standing posture with slight forward bending. Three hundred consecutive discharges of each motor unit were recorded on the data recorder (TEAC R 70 A) , and all the motor units with amplitudes higher than 40 1N were then picked up and fed to the computer (Signal processor 7 T 07, Sanei) . The motor unit discharge was finally displayed as functions of amplitude (peak to peak amplitude) , durations and integral of the action potentials per unit of time in the form of histogram. Moreover, the variation of the intervals between the consecutive discharges was automatically measured and displayed as the interval diagram. In order to analyze the duration of the action potentials with bi-phasic or multi-phasic potentials, all negative deflections were converted to positive deflections and then integrated with a time constant of 1 sec. Then the computer began to measure the duration of these positive deflections which were larger than 40ƒÊV. In normal subjects, a peak in the amplitude histogram during the weak voluntary activation was seen at about 100ƒÊV. In the duration histogram of the weak voluntary activation in normal persons, there was a peak at 2 msec with slopes ending at 8•`10 msec. Thus the histogram consisted of a peak with steep slopes on both sides. During the mild voluntary activation of the muscles, the histograms showed less steep slopes, ending at 10•`42 msec. The intervals in normal persons fell within 128 msec during both weak and mild voluntary muscle activation. The integrate histogram in normal persons (Fig. 1, left) shows

Automatic analysis of EMG in the patients with low back pain.